Wpines, F1fanatic has given excellent advice. I have 501's plugged directly into dedicated 20 amp lines with stock power cords. Your are absolutely making the right move with dedicated lines, one of the biggest improvements I have ever made. I have tried tons of cables and have settled on Kimber Select for IC's, 1021's and 1016's, and Goertz MI 2's for SC. 8TC is an outstanding cable, the Goertz is better in my system, Thiels love these cables. They are the most neutral sounding cables I have tried. You have a great system...good luck with your choices!